Hydrochloric Acid → [3-(Hydroxymethyl)phenyl]boronic acid

3-Bromobenzyl alcohol (2.0 g, 10.7 mmol) was dissolved in dry THF (50 ml) in a dry 100 ml flask flushed with nitrogen. The mixture was chilled in a dry ice/acetone bath. n-Butyl lithium (11 ml of a 2.13M solution in hexane, 23.5 mmol) was added. The reaction was warmed to room temperature for 1 hour, then cooled in an ice water bath. Trimethyl borate (1.3 ml, 11.2 mmol) was added and the mixture was stirred at room temperature overnight, then treated with 2N aqueous HCl to pH 2, and stirred for 3 hours. Brine (15 ml) was added, and the mixture was extracted with ethyl acetate (3×15 ml). The organic materials were combined, dried (MgSO4) then concentrated under reduced pressure which gave of 3-hydroxymethylbenzeneboronic acid (98%) as a clear oil.

1. customflushed with nitrogen
2. temperatureThe mixture was chilled in a dry ice/acetone bath
3. additionn-Butyl lithium (11 ml of a 2.13M solution in hexane, 23.5 mmol) was added
4. temperaturecooled in an ice water bath
5. stirringstirred for 3 hours
6. extractionthe mixture was extracted with ethyl acetate (3×15 ml)
7. dry with materialdried (MgSO4)
8. concentrationthen concentrated under reduced pressure which

ORD record

ord-f0a10164e79b41ac8c9eb60b76cbc32c

Source dataset

uspto-grants-1995_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05444050